PDA

View Full Version : Any ATV owners own an OPPO Dvd Player?




frankiepdx
Jan 24, 2008, 03:19 PM
I am very interested in making a Home Theater Mac or an Apple TV. I own an Oppo upconverting DVD player and it is miles better than my standard players. I'm hoping someone here owns one and could make a comparison or at least have some PQ info. Does it upconvert over HDMI or RGB?

Also, I own a 42 IN Plasma.



Mindflux
Jan 24, 2008, 03:22 PM
I am very interested in making a Home Theater Mac or an Apple TV. I own an Oppo upconverting DVD player and it is miles better than any standard player. I'm hoping someone here owns one and could make a comparison or at least have some PQ info. Does it upconvert over HDMI or RGB?

it doesn't do any upconversion. it plays whatever quality movie/music you give it, within it's limitations.

My buddy bought an Oppo dvd player and promptly returned it. He had horrible overscan.

FreeState
Jan 24, 2008, 04:06 PM
it doesn't do any upconversion. it plays whatever quality movie/music you give it, within it's limitations.

I dont think this is 100% correct. AppleTV can output at 1080i - so it must be up-converting.

The visual quality is different depending on the original source quality and actual picture motion - which has nothing to do with up-converting - garbage in garbage out.

(If Im mistaken Im sure someone here will correct me... I did do a search and most of the post state that :apple:TV does up-convert to 1080i).

northy124
Jan 24, 2008, 04:22 PM
AppleTV can output at 1080i - so it must be up-converting.

Not what i heard/read it can only output 720p (1280x768) and doesn't up-scale even the take two update doesn't up-scale just what i've heard/read.

VideoFreek
Jan 24, 2008, 04:33 PM
I dont think this is 100% correct. AppleTV can output at 1080i - so it must be up-converting.Yes, actually its 0% correct, and you are 100% right. Of course the Apple TV upconverts...when you set it to output at 720p or 1080i, it will output at 720 or 1080 lines of resolution, respectively, regardless of the source material.

It accomplishes this through video scaling (upconverting), which is one of the least-understood aspects of video. For those interested, there is an excellent overview of the topic here (http://www.avsforum.com/avs-vb/showthread.php?t=477740). To summarize a few key points: in theory, upconverting DVD players shouldn't matter, because when you feed a 480p signal to a digital (pixel-based) display such as a plasma or LCD TV, video scalers in the TV will upconvert the 480-line signal to the native resolution of the display--typically 768 or 788 lines in smaller panels, though increasingly we are seeing true 1080-line displays, especially in the larger panels. The only reason upconverting DVD players have a legitimate role is that sometimes, but not always, the video scalers in the DVD player are superior to those built into the TV, and so produce an image with less artifacts and other distortions. Video scaling is quite complex and algorithm-dependent, and so to a certain extent you do get what you pay for when you buy more expensive scaler circuitry. This is why Oppo players are quite popular in A/V enthusiast circles--they are seen as offering some of the best performance bang for the buck. If money is no object, at the lunatic edge you'll find Denon's flagship SD-DVD player (the DVD-5910) for a mere $3,800, which sports a state-of-the-art Realta T2 HQV scaler chip (not to mention a chassis build quality that makes an M1 tank seem like a cardboard box)!

MikieMikie
Jan 24, 2008, 04:33 PM
Not what i heard/read it can only output 720p (1280x768) and doesn't up-scale even the take two update doesn't up-scale just what i've heard/read.

So what's that 1080i doing in my settings menu, then?

jaw04005
Jan 24, 2008, 04:36 PM
So what's that 1080i doing in my settings menu, then?

From what I understand from Apple, it just renders the menu at 1080i. Or maybe not, I'm not really sure. I know it won't play 1080i content.

northy124
Jan 24, 2008, 04:36 PM
So what's that 1080i doing in my settings menu, then?

I think it might be to do with menu being displayed at that but videos are 720p only

MikieMikie
Jan 24, 2008, 04:43 PM
I think it might be to do with menu being displayed at that but videos are 720p only

The fact that it can only handle 720p doesn't mean it can't convert to 1080i.

jaw04005
Jan 24, 2008, 04:46 PM
OK. Apparently, the :apple: TV won't playback videos at 1080i. However, you can select 1080i as a supported resolution.

If you select 1080i, the Apple TV will upscale output to 1080i to conform with your HDTV.

It's up to you—whether you want your HDTV's internal scaler to do most of the up-scaling work or the Apple TV.

For example, if I have a 1366x768 (720p) LCD HDTV. If I choose 720p, my HDTV will upscale the Apple TV's output to 1366x768.

If I choose 1080i, the Apple TV will upscale it's output to 1080i, then my HDTV will downscale the Apple TV's output to 1366x768.

So, I think.

VideoFreek
Jan 24, 2008, 04:50 PM
The fact that it can only handle 720p doesn't mean it can't convert to 1080i.Exactly. These guys are confusing encoding parameters with output resolution. The processor decoding the MPEG stream can only handle up to a certain bitrate (5 Mbps), which limits it to 1280x720 at 24fps. However, the device can scale the decoded stream to 1080i if desired.

VideoFreek
Jan 24, 2008, 04:54 PM
For example, if I have a 1366x768 (720p) LCD HDTV. If I choose 720p, my HDTV will upscale the Apple TV's output to 1366x768.

If I choose 1080i, the Apple TV will upscale it's output to 1080i, then my HDTV will downscale the Apple TV's output to 1366x768.

So, I think.You are correct. In principle, it is better to feed your TV a signal as close to the native resolution of the panel as possible...in your case that would be 720p. Upscaling to 1080, then downscaling back to 768 introduces more artifacts and should be avoided.

MikieMikie
Jan 24, 2008, 05:09 PM
Exactly. These guys are confusing encoding parameters with output resolution. The processor decoding the MPEG stream can only handle up to a certain bitrate (5 Mbps), which limits it to 1280x720 at 24fps. However, the device can scale the decoded stream to 1080i if desired.

Thanks. While I am crazy, I'm not entirely stupid. :D